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USB: ehci-platform: support EHCIs with transaction translator

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Some EHCI controllers have a Transaction Translator built into
the root hub. Support this feature in device tree when using
the ehci-platform driver by adding a feature flag for it.

This is needed to get USB working on NXP LPC18xx/43xx platforms.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joachim Eastwood 2015-05-16 17:17:40 +02:00 committed by Greg Kroah-Hartman
parent ca07e1c1e4
commit 40f2f2a325
2 changed files with 6 additions and 0 deletions
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2
Documentation/devicetree/bindings/usb/usb-ehci.txt
View file

@ -13,6 +13,8 @@ Optional properties:
- big-endian-desc : boolean, set this for hcds with big-endian descriptors
- big-endian : boolean, for hcds with big-endian-regs + big-endian-desc
- needs-reset-on-resume : boolean, set this to force EHCI reset after resume
- has-transaction-translator : boolean, set this if EHCI have a Transaction
Translator built into the root hub.
- clocks : a list of phandle + clock specifier pairs
- phys : phandle + phy specifier pair
- phy-names : "usb"

4
drivers/usb/host/ehci-platform.c
View file

@ -202,6 +202,10 @@ static int ehci_platform_probe(struct platform_device *dev)
"needs-reset-on-resume"))
pdata->reset_on_resume = 1;
if (of_property_read_bool(dev->dev.of_node,
"has-transaction-translator"))
pdata->has_tt = 1;
priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
"phys", "#phy-cells");
priv->num_phys = priv->num_phys > 0 ? priv->num_phys : 1;